Abstract
Using of a doubly-fed machine circuit is a promising way to upgrade existing electric drives of hoist installations based on wound-rotor induction motors. Power connection of induction motors according to the scheme of a doubly-fed machine with control of machine coordinates in the rotor circuit allows to increase the energy efficiency of the drive, organize the recovery of energy, which is usually uselessly dissipated in the rotor circuit, as well as increase the reliability of the drive. To achieve a wide range of speed change while maintaining the overload capacity of the machine by the torque, it is necessary to combine various methods for controlling the amplitude, phase and frequency of the auxiliary voltage on the rotor. These parameters are controlled by a logical control system. So it is necessary to develop an operational algorithm of the logical control system to organize this way of control. This paper is devoted to the development of the operational algorithm of the logical control system for the electric drive of a lifting installation based on a doubly-fedinduction machine, which allows combining different modes of operation of the machine to achieve a wide range of speed control.
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